To change distance measurement in Apple Watch from kilometers to miles, follow these steps:
- Open the Watch app on your iPhone.
- Tap on the “My Watch” tab at the bottom of the screen.
- Tap on “Health” in the list of apps.
- Tap on “Distance Units” and select “Miles” from the list of options.
- Close the Watch app on your iPhone and the change should take effect on your Apple Watch.
Note: the above steps may vary depending on the watchOS version you are using.